EP0824806B1 - Method and apparatus for controlling frequency deviation of a portable transceiver - Google Patents
Method and apparatus for controlling frequency deviation of a portable transceiver Download PDFInfo
- Publication number
- EP0824806B1 EP0824806B1 EP96911410A EP96911410A EP0824806B1 EP 0824806 B1 EP0824806 B1 EP 0824806B1 EP 96911410 A EP96911410 A EP 96911410A EP 96911410 A EP96911410 A EP 96911410A EP 0824806 B1 EP0824806 B1 EP 0824806B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- predetermined
- frequency deviation
- deviation levels
- signal
- levels
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
- H04B17/104—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof of other parameters, e.g. DC offset, delay or propagation times
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/14—Monitoring; Testing of transmitters for calibration of the whole transmission and reception path, e.g. self-test loop-back
Definitions
- the comparator element 524 compares corresponding estimates of the first and second pluralities of frequency deviation levels to derive a plurality of adjusted control signal values for controlling the second plurality of frequency deviation levels.
- the comparator element 524 uses a first control signal element 526 for derivation of the four frequency deviation levels needed for inbound channel transmission.
- the second modulated signal transmitted by portable transceiver 122 preferably has four frequency deviation levels which exceed the two frequency deviation levels transmitted by the base stations 116.
- the first control signal element 526 compares two of the frequency deviation level references element 323 stored in EEPROM 321 with two corresponding frequency deviation levels of the second modulated signal to derive two adjusted control signal values for controlling the two corresponding frequency deviation levels of the second modulated signal.
- an electrical block diagram of the hardware of the transceiver 304 in accordance with the preferred embodiment of the present invention comprises a receiver portion 601 and a transmitter portion 602.
- the transceiver antenna 302 is coupled to an RF switch 624 which switches between the receiver portion 601 and the transmitter portion 602.
- the RF switch is switched to the receiver portion 601 and when inbound messages are to be transmitted, the RF switch 624 is switched to the transmitter portion 602.
- Outbound messages received by the transceiver antenna 302 are transferred over an RF signal bus 603 coupled to the input of a conventional receiver front end mixer 604 utilizing techniques well known in the art.
- the output of the conventional receiver front end mixer 604 is coupled to an intermediate frequency (IF) signal bus 606.
- IF intermediate frequency
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Transceivers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
Claims (10)
- A method of controlling a plurality of frequency deviation levels of a portable transceiver that utilizes a time-division-duplex (TDD) protocol for communicating with a base transceiver, the method comprising in the base transceiver the step of:transmitting (708) a first predetermined modulated signal having a first predetermined plurality of frequency deviation levels during a base-to-portable time slot of the TDD protocol; and the method further comprising in the portable transceiver the steps of:receiving (802) the first predetermined modulated signal to produce a first received signal;measuring the first received signal to derive (824) estimates of the first predetermined plurality of frequency deviation levels, in response to the first received signal passing a predetermined quality test (816);storing (826) the estimates of the first predetermined plurality of frequency deviation levels in a memory;thereafter generating (828) a second predetermined modulated signal having a second predetermined plurality of frequency deviation levels controlled by a plurality of control signal values during a portable-to-base time slot of the TDD protocol;sampling (832) the second predetermined modulated signal to derive a second received signal;appraising (902) the second received signal to derive estimates of the second predetermined plurality of frequency deviation levels;comparing (906-912) corresponding estimates of the first and second predetermined pluralities of frequency deviation levels to derive a plurality of adjusted control signal values for controlling the second predetermined plurality of frequency deviation levels to approximate the first predetermined plurality of frequency deviation levels; andthereafter controlling (914) the second predetermined plurality of frequency deviation levels in accordance with the plurality of adjusted control signal values.
- The method of claim 1,
wherein the transmitting step (708) comprises the step of transmitting a predetermined signal having N predetermined frequency deviation levels, N being a predetermined integer, and
wherein the second predetermined modulated signal has M frequency deviation levels, M being a predetermined integer greater than N, and
wherein the comparing step (906-912) comprises the steps of:comparing (906) the N predetermined frequency deviation levels with N corresponding frequency deviation levels of the second predetermined modulated signal to derive N adjusted control signal values for controlling the N corresponding frequency deviation levels of the second predetermined modulated signal to approximate the N predetermined frequency deviation levels; andinterpolating (908) between the N adjusted control signal values to obtain M-N additional adjusted control signal values corresponding to M-N additional frequency deviation levels of the second modulated signal. - The method of claim 1,
wherein the second predetermined modulated signal has M predetermined frequency deviation levels, M being a predetermined integer, and
wherein the transmitting step (708) comprises the step of transmitting a predetermined signal having N predetermined frequency deviation levels, M of which correspond to the M predetermined frequency deviation levels of the second predetermined modulated signal, N being a predetermined integer equal to or greater than M, and
wherein the comparing step (906-912) comprises the steps of:comparing (910) the M corresponding predetermined frequency deviation levels with the M predetermined frequency deviation levels of the second modulated signal to derive (912) M adjusted control signal values for controlling the M predetermined frequency deviation levels of the second predetermined modulated signal to approximate the M corresponding predetermined frequency deviation levels. - The method of claim 1,
wherein the transmitting step (708) comprises the step of transmitting a predetermined signal having N predetermined frequency deviation levels, N being a predetermined integer, and
wherein ones of the N predetermined frequency deviation levels are transmitted a plurality of times in the predetermined signal, and
wherein the measuring step comprises the steps of:measuring the ones of the N predetermined frequency deviation levels as they are transmitted, to derive (824) a plurality of instantaneous deviation values; andcalculating for the predetermined signal a plurality of mean values from the plurality of instantaneous deviation values corresponding to the ones of the N predetermined frequency deviation levels to derive the estimates of the first predetermined plurality of frequency deviation levels. - The method of claim 1,
wherein the measuring step comprises the steps of:evaluating the first received signal to produce an error count of errors received in the first received signal, for the predetermined quality test; andderiving (824) the estimates of the first predetermined plurality of frequency deviation levels from the first received signal, in response to the error count being less than a predetermined number, andcontrolling (914) the second predetermined plurality of frequency deviation levels in accordance with earlier adjusted control signal values calculated and stored from an earlier received first modulated signal, in response to the error count being equal to or greater than the predetermined number, and the earlier adjusted control signal values being available; andcontrolling (914) the second predetermined plurality of frequency deviation levels in accordance with default control signal values, in response to the error count being equal to or greater than the predetermined number, and the earlier adjusted control signal values not being available. - A portable transceiver (122) for controlling a plurality of frequency deviation levels generated by the portable transceiver for use in a system that utilizes a time-division-duplex (TDD) protocol for communicating, the system having a controller and a base transceiver (116) for transmitting a first predetermined modulated signal having a first predetermined plurality of frequency deviation levels during a base-to-portable time slot of the TDD protocol, the portable transceiver comprising:a processor (308) for controlling the portable transceiver;a receiver (601) coupled to the processor for receiving the first predetermined modulated signal to produce a first received signal;a measurement element (510) coupled to the processor for measuring the first received signal to derive estimates of the first predetermined plurality of frequency deviation levels, in response to the first received signal passing a predetermined quality test;a memory (322) coupled to the processor for storing the estimates of the first predetermined plurality of frequency deviation levels;a transmitter (602) coupled to the processor for generating a second predetermined modulated signal having a second predetermined plurality of frequency deviation levels controlled by a plurality of control signal values during a portable-to-base time slot of the TDD protocol;a sampler element (520) coupled to the processor for sampling the second predetermined modulated signal to derive a second received signal;an appraiser element (522) coupled to the processor for appraising the second received signal to derive estimates of the second predetermined plurality of frequency deviation levels;a comparator element (524) coupled to the processor for comparing corresponding estimates of the first and second predetermined pluralities of frequency deviation levels to derive a plurality of adjusted control signal values for controlling the second predetermined plurality of frequency deviation levels to approximate the first predetermined plurality of frequency deviation levels; anda deviation control element (532) coupled to the processor for controlling the second predetermined plurality of frequency deviation levels in accordance with the plurality of adjusted control signal values.
- The portable transceiver of claim 6, wherein the controller and the base transceiver are adapted to transmit a predetermined signal having N predetermined frequency deviation levels, N being a predetermined integer, and wherein the second predetermined modulated signal has M predetermined frequency deviation levels, M being a predetermined integer greater than N, and wherein the comparator element comprises:a first control signal element (526) coupled to the processor for comparing the N predetermined frequency deviation levels with N corresponding frequency deviation levels of the second modulated signal to derive N adjusted control signal values for controlling the N corresponding frequency deviation levels of the second predetermined modulated signal to approximate the N predetermined frequency deviation levels; andan interpolation element (528) coupled to the processor for interpolating between the N adjusted control signal values to obtain M-N additional adjusted control signal values corresponding to M-N additional frequency deviation levels of the second modulated signal.
- The portable transceiver of claim 6, wherein the second predetermined modulated signal has M frequency deviation levels, M being a predetermined integer, and wherein the controller and the base transceiver transmit a predetermined signal having N predetermined frequency deviation levels, M of which correspond to the M predetermined frequency deviation levels of the second predetermined modulated signal, N being a predetermined integer equal to or greater than M, and wherein the comparator element comprises:a second control signal element (530) coupled to the processor for comparing the M corresponding predetermined frequency deviation levels with the M predetermined frequency deviation levels of the second predetermined modulated signal to derive M adjusted control signal values for controlling the M predetermined frequency deviation levels of the second predetermined modulated signal to approximate the M corresponding predetermined frequency deviation levels.
- The portable transceiver of claim 6, wherein the controller and the base transceiver are adapted to transmit a predetermined signal having N predetermined frequency deviation levels, N being a predetermined integer, and wherein ones of the N predetermined frequency deviation levels are adapted to be transmitted a plurality of times in the predetermined signal, and wherein the measurement element comprises:an instantaneous determination element (512) coupled to the processor for measuring the ones of the N predetermined frequency deviation levels as they are transmitted, to derive a plurality of instantaneous deviation values; anda calculation element (514) coupled to the instantaneous determination element for calculating for the predetermined signal a plurality of mean values from the plurality of instantaneous deviation values corresponding to the ones of the N predetermined frequency deviation levels to derive the estimates of the first predetermined plurality of frequency deviation levels.
- The portable transceiver of claim 6, wherein the measurement element comprises:an evaluation element (516) coupled to the processor for evaluating the first received signal to produce an error count of errors received in the first received signal, for the predetermined quality test; anda derivation element (518) coupled to the processor for deriving the estimates of the first plurality of frequency deviation levels from the first received signal, in response to the error count being less than a predetermined number, anda reversion control element (534) coupled to the processor for controlling the second predetermined plurality of frequency deviation levels in accordance with earlier adjusted control signal values calculated and stored from an earlier received first modulated signal, in response to the error count being equal to or greater than the predetermined number, and the earlier adjusted control signal values being available; anda defaulter control element (536) coupled to the processor for controlling the second predetermined plurality of frequency deviation levels in accordance with default control signal values, in response to the error count being equal to or greater than the predetermined number, and the earlier adjusted control signal values not being available.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US433188 | 1982-10-06 | ||
US08/433,188 US5517491A (en) | 1995-05-03 | 1995-05-03 | Method and apparatus for controlling frequency deviation of a portable transceiver |
PCT/US1996/004077 WO1996035272A1 (en) | 1995-05-03 | 1996-03-25 | Method and apparatus for controlling frequency deviation of a portable transceiver |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0824806A1 EP0824806A1 (en) | 1998-02-25 |
EP0824806A4 EP0824806A4 (en) | 2000-05-03 |
EP0824806B1 true EP0824806B1 (en) | 2004-03-03 |
Family
ID=23719176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96911410A Expired - Lifetime EP0824806B1 (en) | 1995-05-03 | 1996-03-25 | Method and apparatus for controlling frequency deviation of a portable transceiver |
Country Status (5)
Country | Link |
---|---|
US (1) | US5517491A (en) |
EP (1) | EP0824806B1 (en) |
CA (1) | CA2219164C (en) |
DE (1) | DE69631758T2 (en) |
WO (1) | WO1996035272A1 (en) |
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US5457680A (en) * | 1993-05-18 | 1995-10-10 | International Business Machines Corporation | Data gateway for mobile data radio terminals in a data communication network |
-
1995
- 1995-05-03 US US08/433,188 patent/US5517491A/en not_active Expired - Lifetime
-
1996
- 1996-03-25 DE DE69631758T patent/DE69631758T2/en not_active Expired - Lifetime
- 1996-03-25 WO PCT/US1996/004077 patent/WO1996035272A1/en active IP Right Grant
- 1996-03-25 CA CA002219164A patent/CA2219164C/en not_active Expired - Fee Related
- 1996-03-25 EP EP96911410A patent/EP0824806B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69631758T2 (en) | 2004-08-12 |
EP0824806A4 (en) | 2000-05-03 |
EP0824806A1 (en) | 1998-02-25 |
DE69631758D1 (en) | 2004-04-08 |
CA2219164C (en) | 2000-12-05 |
US5517491A (en) | 1996-05-14 |
WO1996035272A1 (en) | 1996-11-07 |
CA2219164A1 (en) | 1996-11-07 |
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